GLP-1 dose logging and reconstitution arithmetic

Keeping an accurate dose log matters more than most people expect, because the useful
information is not any single injection but the pattern across weeks.

Reconstitution arithmetic

Concentration is simply total peptide divided by the volume of bacteriostatic water you add. A 5 mg
vial reconstituted with 2 mL gives 2.5 mg/mL. On a U-100 syringe each unit is 0.01 mL, so 10 units
draws 0.1 mL, which at 2.5 mg/mL is 250 mcg.

The arithmetic is easy to get wrong under time pressure, which is the main argument for writing it
down once and checking it against a calculator rather than redoing it each week. I use the
Peptide Tracker & Calculator for this, and its
reconstitution calculator shows the unit maths directly.

What is worth recording

• date and time of the injection
• the dose in mcg or mg, not in syringe units, because units only mean something alongside the
  concentration
• injection site, so rotation is visible over time
• the vial’s reconstitution date and concentration
• anything notable about tolerance that week

Recording the concentration alongside the dose is the single habit that prevents the most confusion
later, since a half-used vial reconstituted differently produces a completely different unit count for
the same dose.

Terminology that comes up repeatedly is collected in the GLP-1 glossary.

None of this is medical advice. It is recordkeeping practice, and the arithmetic is the part worth
being careful about.